Filament Winding Method and Filament Winding Apparatus

ABSTRACT

A filament winding method performs a hoop winding step including a first step of fixing an end of a fiber bundle to a liner surface at a starting position of hoop winding, a second step of hoop winding the fiber bundle having the end fixed to the liner surface in the first step, a third step of fixing the fiber bundle hoop wound in the second step to the liner surface at an ending position of hoop winding, and a fourth step of cutting the fiber bundle upstream in a fiber bundle supplying direction of the position where the fiber bundle is fixed in the third step.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority under 35 U.S.C. 119 to Japanese PatentApplication Nos. 2011-203621, filed on Sep. 16, 2011, and 2011-203638,filed on Sep. 16, 2011, which applications are hereby incorporated byreference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a filament winding method and afilament winding apparatus.

2. Description of the Related Art

A known filament winding apparatus includes a hoop winding device and ahelical winding device, and winds a fiber bundle around a periphery of aliner to form a reinforcement layer by repeatedly performing hoopwinding and helical winding alternately with respect to the liner (e.g.,US Patent Publication No. US/2010/032510A1).

In a conventional hoop winding device, when the hoop winding isfinished, the hoop winding device is moved to a retreated positionlocated away from the liner with the hoop-wound fiber bundle stillconnected to a liner surface. The helical winding is then carried outover the hoop winding, and when the helical winding is finished, thehoop winding device is moved to a position to start the next hoopwinding. In this case, the movement is started while carrying out easywinding from the retreated position. Easy winding is a winding methodcarried out when moving the hoop winding device while winding the fiberbundle, and the easy-wound fiber bundle is not involved in the formationof the reinforcement layer.

After the hoop winding device is moved to an end of the liner whileperforming the easy winding, the hoop winding device starts combinationwinding. Combination winding is a winding method of gradually moving awinding position of the fiber bundle to a hoop winding starting positionwhile alternately winding the fiber bundle around both ends of the linera plurality of times (e.g., Japanese Unexamined Patent Publication No.2009-174700).

Combination winding is carried out because the fiber bundle slips andcannot be wound even if the hoop winding is carried out at an inclinedportion such as a dome portion of the liner. Thus, the fiber bundle canbe wound around the dome portion by winding the fiber bundle at an angleof pulling the fiber bundle in an axial direction of the liner bycombination winding, and the angle is gradually changed to the angle ofhoop winding at a tubular portion of the liner where the fiber bundledoes not slip.

As described above, in a conventional filament winding apparatus, sincehoop winding and helical winding are continuously performed, thehoop-wound fiber bundle remains connected to the liner surface withoutbeing cut when the hoop winding is finished and the helical winding isto be carried out next. Therefore, an operator is not required to fixthe fiber bundle to the liner surface by manual operation when carryingout hoop winding next.

However, when helical winding is finished and the next hoop winding isto be carried out, the hoop winding device is moved while carrying outeasy winding and combination winding of the fiber bundle from theretreated position to the hoop winding starting position. Thus, if thehoop-wound fiber bundle remains connected to the liner surface withoutbeing cut, the time to carry out easy winding and combination winding ofthe fiber bundle becomes necessary, which may lengthen the time requiredfor hoop winding. Easy winding and combination winding of the fiberbundle are hardly involved in the formation of the reinforcement layerof the liner. Thus, an excessive fiber bundle is used, which may lead toincrease in manufacturing cost.

BRIEF SUMMARY OF THE INVENTION

The present invention contributes to reduction of the time required forhoop winding since easy winding and combination winding of the fiberbundle are not necessary when starting hoop winding, regardless ofwhether or not a fiber layer is formed on a liner. The present inventionalso contributes to reduction of usage amount of the fiber bundle andmanufacturing cost since easy winding and combination winding of thefiber bundle are not necessary.

One embodiment of the present invention relates to a filament windingmethod for performing a hoop winding step. The hoop winding stepincludes a first step of fixing an end of a fiber bundle to a linersurface at a starting position of hoop winding, a second step of hoopwinding the fiber bundle having the end fixed to the liner surface inthe first step, a third step of fixing the fiber bundle hoop wound inthe second step to the liner surface at an ending position of the hoopwinding, and a fourth step of cutting the fiber bundle upstream in afiber bundle supplying direction of a position where the fiber bundle isfixed in the third step.

According to this embodiment, when starting the hoop winding, the end ofthe fiber bundle is fixed to the liner surface to start the hoop windingat the starting position of the hoop winding. When ending the hoopwinding, the fiber bundle is fixed to the liner surface to be cut at theending position of the hoop winding. When starting the hoop winding insuch a manner, the end of the fiber bundle is fixed to the liner surfaceto start the hoop winding at the starting position of the hoop winding.Consequently, easy winding and combination winding of the fiber bundleare not necessary and the time required for the hoop winding can beshortened. Furthermore, since easy winding and combination winding ofthe fiber bundle are not necessary, the usage amount of the fiber bundlecan be reduced and the manufacturing cost can be reduced.

According to one example of the embodiment described above, the fiberbundle includes a thermosetting resin or a thermoplastic resin; and thefixation of the fiber bundle to the liner surface in the first step andthe third step brings the fiber bundle into contact with the linersurface and heats a contacting portion.

According to this example, the fiber bundle includes a thermosettingresin or a thermoplastic resin, and the fixation of the fiber bundle tothe liner surface brings the fiber bundle into contact with the linersurface and heats the contacting portion. The thermosetting resin or thethermoplastic resin is thereby cured or welded, and the fiber bundle canbe fixed to the liner surface.

According to another example of the embodiment described above, thesecond step includes, a fifth step of starting the hoop winding with atension of the fiber bundle set lower than a defined tension, andperforming the hoop winding for a predetermined number of times suchthat the fiber bundles overlap, and a sixth step of performing the hoopwinding with the tension of the fiber bundle set to the defined tension.

According to this example, the fiber bundle is fixed to the linersurface, and thereafter, the hoop winding is started with the tension ofthe fiber bundle set lower than the defined tension and the hoop windingis carried out for a predetermined number of times such that the fiberbundles overlap. The fixing portion of the fiber bundle thus can beprevented from being pulled at high tension and detaching. Furthermore,the reinforcement layer having the defined strength can be formed sincethe hoop winding is carried out with the tension of the fiber bundle setto the defined tension after carrying out the hoop windings for apredetermined number of times such that the fiber bundles overlap.

According to a further example of the embodiment described above, thefifth step includes performing the hoop winding such that the fiberbundles intersect.

According to this example, the fiber bundle is fixed to the linersurface, and thereafter, the hoop winding is started with the tension ofthe fiber bundle set lower than the defined tension, and the hoopwinding is carried out such that the fiber bundles intersect. Thus,since the fiber bundle underneath is tightened and fixed by the topsidefiber bundle, the fixing portion of the fiber bundle can be reliablyprevented from detaching by being pulled at high tension.

Another embodiment of the present invention relates to a filamentwinding apparatus for winding a fiber bundle around a liner surface witha hoop winding device. The hoop winding device includes a windingsection, a fixing portion, a cutter, and a control section. The windingsection hoop winds the fiber bundle around the liner surface. The fixingportion fixes the fiber bundle to the liner surface. The cutter cuts thefiber bundle. The control section controls a first fixing operation bythe fixing portion to fix an end of the fiber bundle to the linersurface at a starting position of the hoop winding, a winding operationby the winding section to hoop wind the fiber bundle having the endfixed to the liner surface, a second fixing operation by the fixingportion to fix the hoop-wound fiber bundle to the liner surface at anending position of the hoop winding, and a cutting operation by thecutter to cut the fiber bundle upstream in a fiber bundle supplyingdirection of a position where the fiber bundle is fixed in the secondfixing operation.

According to this embodiment, when starting the hoop winding, the end ofthe fiber bundle is fixed to the liner surface to start the hoop windingat the starting position of the hoop winding. When ending the hoopwinding, the fiber bundle is fixed to the liner surface to be cut at theending position of the hoop winding. When starting the hoop winding insuch a manner, the end of the fiber bundle is fixed to the liner surfaceto start the hoop winding at the starting position of the hoop winding.Consequently, the easy winding and the combination winding of the fiberbundle are not necessary and the time required for the hoop winding canbe shortened. Furthermore, since easy winding and combination winding ofthe fiber bundle are not necessary, the usage amount of the fiber bundlecan be reduced and the manufacturing cost can be reduced.

According to one example of the embodiment described above, the fiberbundle includes a thermosetting resin or a thermoplastic resin; and thefixing portion brings the fiber bundle into contact with the linersurface and heats the contacting portion.

According to this example, the fiber bundle includes a thermosettingresin or a thermoplastic resin, and the fixation of the fiber bundle tothe liner surface brings the fiber bundle into contact with the linersurface and heats the contacting portion. The thermosetting resin or thethermoplastic resin is thereby cured or welded, and the fiber bundle canbe fixed to the liner surface.

According to another example of the embodiment described above, thefixing portion includes a heater for heating the fiber bundle, and agripping part capable of gripping the fiber bundle both upstream anddownstream in the fiber bundle supplying direction with respect to theheater. The control section controls a first gripping operation by thegripping part to grip the fiber bundle downstream in the fiber bundlesupplying direction with respect to the heater in the first fixingoperation, and a second gripping operation by the gripping part to gripthe fiber bundle upstream in the fiber bundle supplying direction withrespect to the heater in the second fixing operation.

According to this example, when starting the hoop winding, the grippingpart grips the fiber bundle downstream in the fiber bundle supplyingdirection with respect to the heater, brings the fiber bundle intocontact with the liner surface and heats the contacting portion with theheater. Consequently, the end of the fiber bundle can be fixed to theliner surface at the starting position of the hoop winding. When endingthe hoop winding, the fiber bundle is gripped upstream in the fiberbundle supplying direction with respect to the heater, the fiber bundleis brought into contact with the liner surface, and the contactingportion is heated with the heater. Consequently, the fiber bundle can befixed to the liner surface to be cut with the cutter at the endingposition of the hoop winding. The starting and ending of the hoopwinding are thus automated and promptly carried out, whereby the timerequired for the hoop winding can be shortened.

Another embodiment of the present invention relates to a filamentwinding method for performing a hoop winding step that includes first tosixth steps. The first step winds a fiber bundle around a holdingsection on an outer side in a radial direction of a liner to temporarilyhold the fiber bundle. The second step moves a winding position of thefiber bundle from the holding section to the liner to start the hoopwinding of the fiber bundle around the liner at a starting position ofthe hoop winding. The third step cuts the fiber bundle bridged from theholding section to the liner. The fourth step performs the hoop windingof the fiber bundle with respect to the liner. The fifth step moves thewinding position of the fiber bundle from the liner to the holdingsection to wind the fiber bundle around the holding section and hold thefiber bundle at an ending position of the hoop winding. The sixth stepcuts the fiber bundle bridged from the liner to the holding section.

According to this embodiment, when starting the hoop winding, thewinding position of the fiber bundle is moved from the holding sectionto the liner to start the hoop winding of the fiber bundle around theliner at the starting position of the hoop winding. When ending the hoopwinding, the winding position of the fiber bundle is moved from theliner to the holding position, and the fiber bundle is wound around theholding position to hold the fiber bundle at the ending position of thehoop winding. When starting the hoop winding in such a manner, thewinding position of the fiber bundle is moved from the holding positionto the liner at the starting position of the hoop winding. Consequently,easy winding and combination winding of the fiber bundle are notnecessary when starting the hoop winding regardless of whether or notthe fiber layer is formed on the liner, and the time required for thehoop winding can be shortened. Since easy winding and combinationwinding of the fiber bundle are not necessary, the usage amount of thefiber bundle can be reduced and the manufacturing cost can be reduced.

A further embodiment of the present invention relates to a filamentwinding apparatus for winding a fiber bundle around a liner with a hoopwinding device that includes a winding section, a holding section, acutter, and a control section. The winding section performs hoop windingof the fiber bundle with respect to the liner. The holding section canbe wound around with the fiber bundle by the winding section and cantemporarily hold the fiber bundle on an outer side in a radial directionof the liner. The cutter cuts the fiber bundle. The control sectioncontrols a winding starting operation, a first cutting operation, awinding operation, a retreating operation, and a second cuttingoperation. The winding starting operation moves a winding position ofthe fiber bundle from the holding section to the liner to start the hoopwinding of the fiber bundle around the liner at a starting position ofthe hoop winding after winding the fiber bundle around the holdingsection. The first cutting operation cuts the fiber bundle bridged fromthe holding section to the liner with the cutter. The winding operationperforms the hoop winding of the fiber bundle with respect to the liner.The retreating operation moves the winding position of the fiber bundlefrom the liner to the holding section to wind the fiber bundle aroundthe holding section and holds the fiber bundle at an ending position ofthe hoop winding. The second cutting operation cuts the fiber bundlebridged from the liner to the holding section by the cutter.

According to this embodiment, when starting the hoop winding, thewinding starting operation of moving the winding position of the fiberbundle from the holding section to the liner to start the hoop windingof the fiber bundle around the liner is carried out at the startingposition of the hoop winding. When ending the hoop winding, theretreating operation of moving the winding position of the fiber bundlefrom the liner to the holding section and winding the fiber bundlearound the holding section to hold the fiber bundle is carried out atthe ending position of the hoop winding. When starting the hoop windingin such a manner, the winding position of the fiber bundle is moved fromthe holding position to the liner at the starting position of the hoopwinding. Consequently, easy winding and combination winding of the fiberbundle are not necessary when starting the hoop winding regardless ofwhether or not the fiber layer is formed on the liner, and the timerequired for the hoop winding can be shortened. Since easy winding andcombination winding of the fiber bundle are not necessary, the usageamount of the fiber bundle can be reduced and the manufacturing cost canbe reduced.

According to an example of the embodiment described above, the controlsection performs control to change a relative position between thewinding section and the holding section in an axial direction of theliner in the winding starting operation and the retreating operation.

According to this example, the relative position between the windingsection and the holding section is changed in the axial direction of theliner in the winding starting operation and the retreating operation.Thus, the winding starting operation and the retreating operation can becarried out with fewer operations.

According to another example of the embodiment described above, theholding section is configured by a plurality of members arranged in acircumferential direction of the liner, the plurality of members beingmoved in the radial direction of the liner to enlarge or reduce theholding section.

According to this example, the holding section is configured by aplurality of members arranged in a circumferential direction of theliner, and the plurality of members are moved in the radial direction ofthe liner to enlarge or reduce the holding section. Thus, the liner ofdifferent radius can be easily employed.

According to a further example of the embodiment described above, theholding section includes a guiding section for guiding the fiber bundlefrom the liner to the holding section in the retreating operation.

The holding section includes the guiding section for guiding the fiberbundle from the liner to the holding section in the retreatingoperation. Thus, the fiber bundle can be reliably wound around theholding section in the retreating operation.

Other features, elements, processes, steps, characteristics andadvantages of the invention will become more apparent from the followingdetailed description of embodiments of the invention with reference tothe attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of an FW device according to a first embodimentillustrating a state in which a hoop winding device is at a windingstart position;

FIG. 2 is a side view of the FW device according to the first embodimentillustrating a state in which the hoop winding device is carrying outhoop winding;

FIG. 3 is a side view of the FW device according to the first embodimentillustrating a state in which the hoop winding device is at a standbyposition;

FIG. 4 is a side view of the hoop winding device;

FIG. 5 is a front view of the hoop winding device seen from a directionof an arrow C in FIG. 4;

FIG. 6 is a view illustrating an operation of fixing an end of the fiberbundle to an outer circumferential surface of the liner at a startingposition of the hoop winding;

FIG. 7 is a view illustrating a state in which a processing section ismoved to a retreated position;

FIG. 8 is a view illustrating a gripping operation of gripping the fiberbundle upstream in a fiber bundle supplying direction with respect to aheater;

FIG. 9 is a view illustrating a fixing operation of fixing thehoop-wound fiber bundle to the outer circumferential surface of theliner at an ending position of the hoop winding;

FIG. 10 is a view illustrating a cutting operation of cutting the fiberbundle upstream in the fiber bundle supplying direction of the positionwhere the fiber bundle is fixed;

FIG. 11 is a view illustrating a state in which the processing sectionis moved to the retreated position;

FIG. 12 is a side view of an FW device according to a second embodiment;

FIG. 13 is a front view of a winding table of a hoop winding device seenfrom a direction of an arrow C in FIG. 12;

FIG. 14 is a front view of a yarn hooking device of the hoop windingdevice seen from a direction of an arrow D in FIG. 12;

FIG. 15 is a side view of the hoop winding device and the linerillustrating a state of a winding starting operation;

FIG. 16 is a cross-sectional view of the hoop winding device and theliner cut along line 5′-5′ of FIG. 15;

FIG. 17 is a side view of the hoop winding device and the linerillustrating a state of the winding starting operation;

FIG. 18 is a cross-sectional view of the hoop winding device and theliner cut along line 7′-7′ of FIG. 17;

FIG. 19 is a side view of the hoop winding device and the linerillustrating a state of the winding operation;

FIG. 20 is a side view of the hoop winding device and the linerillustrating a state of a retreating operation;

FIG. 21 is a cross-sectional view of the hoop winding device and theliner cut along line 10′-10′ of FIG. 20;

FIG. 22 is a side view of the hoop winding device and the linerillustrating a state of the retreating operation; and

FIG. 23 is a cross-sectional view of the hoop winding device and theliner cut along line 12′-12′ of FIG. 22.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION First Embodiment

First, an overall structure of a filament winding apparatus 100according to a first embodiment of the present invention will bedescribed with reference to FIGS. 1-3. Hereinafter, the filament windingapparatus 100 will be referred to as the FW device 100 for short.

FIGS. 1-3 are side views illustrating the FW device 100.

FIG. 1 illustrates a state in which a hoop winding device 30 is at awinding start position. FIG. 2 illustrates a state in which the hoopwinding device 30 is carrying out hoop winding. FIG. 3 illustrates astate in which the hoop winding device 30 is at a standby position. TheFW device 100 winds a fiber bundle F impregnated with resin around aliner 1 by repeatedly carrying out hoop winding by the hoop windingdevice 30 and helical winding by a helical winding device 40 alternatelywith respect to the liner 1.

Arrows A, B illustrated in FIG. 1 indicate a front-back direction of theFW device 100, and a transfer direction of the liner 1 in the helicalwinding. In the helical winding, the liner 1 reciprocates in thefront-back direction of the FW device 100, and hence the liner 1 may betransferred in the direction of the arrow A or may be transferred in thedirection of the arrow B.

The liner 1 is a substantially cylindrical hollow container made of ahigh strength aluminum material, polyamide resin, or the like, forexample. A pressure resistance property of the liner 1 is improved bywinding a fiber bundler F around an outer circumferential surface 1S ofthe liner 1. That is, the liner 1 becomes a base material thatconstitutes a pressure resistant container. In the followingdescription, the liner 1 refers to both a state before winding the fiberbundle F and a state in the middle of winding the fiber bundle F. Forexample, the outer circumferential surface 1S of the liner 1 also refersto a surface of the wound fiber bundle F.

The FW device 100 is mainly configured by a main base 10, a linertransfer device 20, the hoop winding device 30, a helical winding device40, and a control section C. The main base 10 configures the basis ofthe FW device 100. A liner transfer device rail 11 is arranged at anupper part of the main base 10. The liner transfer device 20 is mountedon the liner transfer device rail 11. A hoop winding device rail 12 isarranged parallel to the liner transfer device rail 11 at the upper partof the main base 10. The hoop winding device 30 is mounted on the hoopwinding device rail 12. According to this structure, the liner transferdevice 20 and the hoop winding device 30 can be moved with respect tothe main base 10. The helical winding device 40 is fixed to the mainbase 10.

The liner transfer device 20 rotates the liner 1 with a rotation axis ina direction along the front-back direction of the FW device 100 as acenter, and transfers the liner 1 in the front-back direction of the FWdevice 100. The liner transfer device 20 is mainly configured by a base21 and liner supporting sections 22. The driving of the liner transferdevice 20 is controlled by the control section C.

The base 21 supports a pair of liner supporting sections 22. Each of theliner supporting sections 22 includes a liner supporting frame 23 and asupporting shaft 24. The liner supporting frame 23 extends from the base21 towards an upper side. The supporting shaft 24 extends from the linersupporting frame 23 along the front-back direction of the FW device. Thesupporting shaft 24 is rotated in one direction about an axis by a powermechanism. The supporting shaft 24 supports both ends of the liner 1,and rotates the liner 1. According to this structure, the liner transferdevice 20 rotates the liner 1 with the supporting shaft 24 as a rotationaxis, and transfers the liner 1 in the front-back direction of the FWdevice 100.

The hoop winding device 30 is a device for hoop winding the fiber bundleF around the outer circumferential surface 1S of the liner 1. In thehoop winding, the fiber bundle F is wound around the outercircumferential surface 1S of the liner 1 such that a winding angle ofthe fiber bundle F with respect to a center axis of the liner 1 becomesapproximately 90 degrees. The hoop winding device 30 is mainlyconfigured by a base 31, a power mechanism 32, a hoop winding unit 33,and a fiber bundle processing device 50. The driving of the hoop windingdevice 30 is controlled by the control section C.

The power mechanism 32 and the hoop winding unit 33 are arranged on thebase 31. The hoop winding unit 33 includes a winding table 34 andbobbins 71 (71A, 71B, 71C, 71D) (see FIG. 5). The winding table 34includes a space where the liner 1 is inserted at the center. Thebobbins 71 (71A, 71B, 71C, 71D) are arranged on the winding table 34 tosupply the fiber bundle F to the outer circumferential surface 1S of theliner 1. The power mechanism 32 rotates the hoop winding unit 33 aboutthe center axis of the liner 1.

In the hoop winding, the position of the liner 1 is fixed, and the hoopwinding unit 33 is rotated about the center axis of the liner 1 whilecausing the hoop winding device 30 to reciprocate along the center axisdirection of the liner 1. The hoop winding is thereby carried out. Thewinding mode of the fiber bundle F can be freely changed by adjusting amovement speed of the hoop winding device 30 and a rotation speed of thewinding table 34. The fiber bundle processing device 50 will bespecifically described later.

The helical winding device 40 is a device for helical winding the fiberbundle F around the outer circumferential surface 18 of the liner 1. Inthe helical winding, the fiber bundle F is wound around the outercircumferential surface 1S of the liner 1 such that the winding angle ofthe fiber bundle F becomes a predetermined value (e.g., 0 to 60degrees). The helical winding device 40 is mainly configured by a base41 and a helical winding unit 42. The driving of the helical windingdevice 40 is controlled by the control section C.

The helical winding unit 42 is arranged on the base 41. The helicalwinding unit 42 includes a first helical head 43 and a second helicalhead 44. The fiber bundle F is supplied from a plurality of bobbins tothe first helical head 43 and the second helical head 44, and the fiberbundle F is guided to the outer circumferential surface 1S of the liner1.

In the helical winding, the helical winding device 40 is fixed, and theliner 1 is transferred in the rotation axis direction while beingrotated by the liner transfer device 20. The helical winding is therebycarried out. The winding mode of the fiber bundle F can be freelychanged by adjusting the transfer speed and the rotation speed of theliner 1.

The fiber bundle processing device 50 of the hoop winding device 30,which is a characteristic portion of the present invention, is nowdescribed. FIG. 4 is a side view of the hoop winding device 30, and FIG.5 is a front view of a hoop winding device 30 seen from a direction ofan arrow C of FIG. 4.

First, the hoop winding device 30 will be specifically described. Asillustrated in FIGS. 4 and 5, the bobbins 71 (71A, 71B, 71C, 71D), afiber supply guide 72, and a guide roller 73 are arranged on the windingtable 34 of the hoop winding device 30. The bobbins 71 (71A, 71B, 71C,71D) are arranged at equal intervals around the liner 1, which isinserted to the winding table 34, and supply the fiber bundle F to theliner 1. The guide roller 73 gathers four fiber bundles F from thebobbins 71A, 71B, 71C, 71D and guides the same to the fiber supply guide72. The fiber supply guide 72 supplies four fiber bundles F gathered bythe guide roller 73 to the outer circumferential surface 1S of the liner1.

The winding table 34 is rotated in a direction of an arrow R in FIG. 5by the power mechanism 32. The fiber bundle F guided from the fibersupply guide 72 to the liner 1 is wound around the outer circumferentialsurface 1IS of the liner 1 while being rotated in the direction of thearrow R. The fiber bundle F is supplied in the direction of an arrow FA,which is the downstream side in the rotating direction of the windingtable 34. The direction FA in which the fiber bundle F is supplied ishereinafter referred to as a fiber supplying direction FA. A base endside of the arrow FA is the upstream side in the fiber supplyingdirection FA, and a leading end side of the arrow FA is the downstreamside in the fiber supplying direction. FA. A position where the fiberbundle F guided from the fiber supply guide 72 to the liner 1 is broughtinto contact and wound around the outer circumferential surface 1S ofthe liner 1 is referred to as a winding position WP.

The power mechanism 32 for driving the winding table 34 is connected tothe control section C, where the rotation and stop are controlled basedon a signal from the control section C. A detecting section that detectsthe rotation angle of the winding table 34 and detects the position ofthe winding table 34 is connected to the control section C. An encoder,for example, is used for the detecting section. The control section Cdetects the position of the winding table 34 to specify the position ofthe bobbins 71 (71A, 71B, 71C, 71D), the winding position WP of thefiber bundle F, and the like. The control section C controls the powermechanism 32 while detecting the position of the winding table 34 tostop the rotation of the winding table 34 such that the fiber supplyguide 72 and the winding position WP of the fiber bundle F come to anarbitrary position.

Next, the fiber bundle processing device 50 will be described. Asillustrated in FIGS. 4 and 5, the fiber bundle processing device 50mainly includes a processing section 51, an arm 52, and a drivingsection 53. The fiber bundle processing device 50 is arranged on theside where the winding of the fiber bundle F is carried out in thewinding table 34, that is, on the same side as the bobbins 71 (71A, 71B,71C, 71D), the fiber supply guide 72, and the like. The fiber bundleprocessing device 50 is connected to the control section C, and drivesthe processing section 51 and the driving section 53 based on the signalfrom the control section C. A supporting section 54 supports the fiberbundle processing device 50, and is fixed to the base 31.

The processing section 51 performs an operation of fixing the fiberbundle F supplied from the fiber supply guide 72 of the winding table 34to the outer circumferential surface 1S of the liner 1 at the start andat the end of the hoop winding. The processing section 51 includes aprocessing section main body 55, a fixing portion 61, and a cutter 62.

The fixing portion 61 and the cutter 62 are supported by the processingsection main body 55. The arm 52 supports the processing section 51, anda first end is fixed to the processing section main body 55 and a secondend is fixed to the driving section 53. The driving section 53 swingsthe arm 52 and the processing section 51. A motor serving as a drivesource and a gear for transmitting the driving force of the motor to thearm 52 are arranged. The driving section 53 is mounted on the supportingsection 54. As illustrated in FIG. 5, the driving section 53 swings thearm 52 based on a control signal from the control section C to switchthe position of the processing section 51 between an activated positionPA and a retreated position PB.

The activated position PA of the processing section 51 is a positionwhere the processing section 51 performs the operation of fixing thefiber bundle F to the outer circumferential surface 18 of the liner 1 atthe start and at the end of the hoop winding. The retreated position PBof the processing section 51 is a position where the processing section51 and the arm 52 do not interfere with the rotating winding table 34,the bobbins 71 (71A, 71B, 71C, 71D), the fiber bundle F, and the likewhen hoop winding the fiber bundle F around the outer circumferentialsurface 1S of the liner 1.

The fixing portion 61 includes a heater 63 and a gripping part 64. Theheater 63 includes heating means. The heater 63 makes contact with thefiber bundle F supplied from the fiber supply guide 72 of the windingtable 34 to heat the thermosetting resin or the thermoplastic resinimpregnated in the fiber bundle F. Consequently, the resin is cured orwelded in a short time to fix the fiber bundle F to the outercircumferential surface 18 of the liner 1. In the present embodiment,the thermosetting resin is used for the resin impregnated in the fiberbundle F. The heater 63 is arranged in a fixing portion main body 65.The fixing portion main body 65 is connected to a motor 66 serving as adrive source. The motor 66 is mounted to the processing section mainbody 55. The heater 63 is swung by a predetermined angle by the drivingof the motor 66 based on the signal of the control section C (see FIG. 6to FIG. 11).

The heating means arranged in the heater 63 may be known heating meanssuch as resistance heating, induction heating and the like. Thethermosetting resin or the thermoplastic resin to be impregnated in thefiber bundle F may be impregnated after the fiber bundle F is suppliedfrom the bobbins 71 (71A, 71B, 71C, 71D) and before the fiber bundle Fis wound around the liner 1. Alternatively, a prepreg in which thethermosetting resin or the thermoplastic resin is impregnated in advancemay be used. Furthermore, the resin for fixing the fiber bundle F to theouter circumferential surface 1S of the liner 1 may be partiallyimpregnated.

The gripping part 64 grips the fiber bundle F when fixing the fiberbundle F to the outer circumferential surface 1S of the liner 1. Thegripping part 64 includes a chucker 67 and a moving section 68. Thechucker 67 includes an open/close port, and approaches the fiber bundleF supplied from the fiber supply guide 72 of the winding table 34 withthe open/close port greatly opened. When the fiber bundle F is caughtinside the open/close port, the fiber bundle F is gripped by closing theopen/close port.

The moving section 68 switches the position of the chucker 67 withrespect to the heater 63. The moving section 68 is, for example, an aircylinder, and fixes the chucker 67 to a leading end of an extensiblerod. The moving section 68 is mounted to the processing section mainbody 55. The position of the chucker 67 is switched to downstream (seeFIG. 6) and upstream (see FIG. 8) in the fiber bundle supplyingdirection FA with respect to the heater 63 by the moving section 68. Thechucker 67 can grip the fiber bundle F at any position.

The cutter 62 cuts the fiber bundle F supplied from the fiber supplyguide 72 of the winding table 34. The cutter 62 is arranged to moveforward and backward with respect to the fixing portion main body 65.When cutting the fiber bundle F, the cutter 62 projects out with respectto the fixing portion main body 65 to cut the fiber bundle F. Instandby, the cutter 62 is retracted into the fixing portion main body 65and retreats to a position not making contact with the fiber bundle F.

A positional relationship between the winding table 34 and the fiberbundle processing device 50 will now be described. In the positionalrelationship between the winding table 34 and the fiber bundleprocessing device 50 illustrated in FIG. 5, the position of theprocessing section 51 is switched between the activated position PA andthe retreated position PB. The position is switched between theactivated position PA and the retreated position PB while the windingtable 34 is stopped at the start and at the end of the hoop winding.However, even when the winding table 34 is stopped, if the position(rotation position) of the winding table 34 differs from the position(rotation position) illustrated in FIG. 5, the winding table 34 mayinterfere with the bobbins 71A, 71B, 71C, 71D, the fiber supply guide72, the guide roller 73, and the fiber bundle F wound therearound. Theprocessing section 51 is also required to perform the operation ofgripping the fiber bundle F supplied from the fiber supply guide 72 ofthe winding table 34, and fixing the fiber bundle F to the outercircumferential surface 1S of the liner 1.

Thus, in the present embodiment, while the position of the processingsection 51 is switched between the activated position PA and theretreated position PB and while the processing section 51 is positionedat the activated position PA, the position (rotation position) of thewinding table 34 is maintained such that the processing section 51 ispositioned between the bobbin 71A and the bobbin 71D, as illustrated inFIG. 5. This position (rotation position) of the winding table 34 ishereinafter referred to as a processing stop position.

Next, the operation of the fiber bundle processing device 50 in the hoopwinding of the FW device 100 having the above structure will bedescribed. The liner 1 used in the present embodiment includes a firsttubular portion 1A having a prescribed radius, a dome portion 1Barranged at both ends of the tubular portion 1A, and a second tubularportion 1C arranged at the end of the dome portion 1B (see FIG. 3). Theliner 1 is mounted to the liner transfer device 20, and the hoop windingis performed following the helical winding performed previously.Thereafter, the helical winding is performed again. The windingconditions of the hoop winding, that is, the winding conditions such asthe movement speed of the hoop winding device 30, the rotation speed ofthe winding table 34, the number of times to reciprocate the hoopwinding device 30, and the movement distance of the hoop winding device30 are input to the control section C in advance by the operator. Thecontrol section C controls the driving of the hoop winding device 30 inthe following manner based on the input winding conditions.

After the helical winding before the hoop winding is finished, the hoopwinding device 30 is moved along the front-back direction of the FWdevice 100 from the standby position (see FIG. 3) to move to theposition to start the hoop winding, as illustrated in FIG. 1. In thepresent embodiment, the hoop winding is assumed to start from one end ofthe tubular portion 1A of the liner 1. When the hoop winding device 30is moved, the winding table 34 is at the processing stop position, andthe processing section 51 is at the retreated position PB (see FIG. 11).The chucker 67 grips the fiber bundle F supplied from the fiber supplyguide 72 of the winding table 34.

As illustrated in FIG. 1, when the hoop winding device 30 reaches theposition to start the hoop winding, as illustrated in FIG. 6, theprocessing section 51 is moved to the activated position PA by theswinging of the arm 52. The position of the chucker 67 is downstream inthe fiber bundle supplying direction FA with respect to the heater 63.The heater 63 is directed towards an outer circumferential surface 1ASof the tubular portion 1A by the swinging of the fixing portion mainbody 65. The heater 63 brings the fiber bundle F into contact with theouter circumferential surface 1AS of the tubular portion 1A and heatsthe contacting portion, whereby the thermosetting resin impregnated inthe fiber bundle F is cured and the end of the fiber bundle F is fixedto the fiber bundle F wound in the helical winding. The cutter 62 isretracted to the fixing portion main body 65, and is retreated to theposition not making contact with the fiber bundle F.

As illustrated in FIG. 7, when the end of the fiber bundle F is fixed tothe outer circumferential surface 1AS of the tubular portion 1A, theprocessing section 51 is moved to the retreated position PB by theswinging of the arm 52. When the processing section 51 is moved to theretreated position PB, the hoop winding device 30 starts the winding ofthe fiber bundle F. For the first few windings, a tension of the fiberbundle F is set lower than a defined tension, and in this state, thesubsequent fiber bundle F is wound so as to overlap the fiber bundle Fwound underneath. Alternatively, the subsequent fiber bundle F is woundso as to intersect the fiber bundle F wound underneath. After windingthe first few windings, the tension of the fiber bundle F is set to thedefined tension and the hoop winding is carried out.

As illustrated in FIG. 2, the fiber bundle F is hoop wound around theouter circumferential surface 1AS of the tubular portion 1A by movingthe hoop winding device 30 in the right direction in the figure whilerotating the winding table 34. A first hoop winding layer is formed inthis state. Thereafter, the hoop winding device 30 is inverted and movedto form a second hoop winding layer on the outer surface of the previoushoop winding layer. When further forming the hoop winding layer, thehoop winding is carried out for a required number of times byreciprocating the hoop winding device 30.

After the hoop winding of the required number of times is finished, thewinding table 34 is stopped at the processing stop position, asillustrated in FIG. 8. The processing section 51 is moved from theretreated position PB towards the activated position PA. The chucker 67is located upstream in the fiber bundle supplying direction FA withrespect to the heater 63. The chucker 67 is brought close to the fiberbundle F supplied from the fiber supply guide 72 of the winding table 34with the open/close port greatly being opened, and grips the fiberbundle F by closing the open/close port when the fiber bundle F iscaught inside the open/close port. The heater 63 is directed towards theouter circumferential surface 1AS of the tubular portion 1A by theswinging of the fixing portion main body 65 so as not to come intocontact with the fiber bundle F. The cutter 62 is retracted into thefixing portion main body 65 and retreats to the position not makingcontact with the fiber bundle F.

In FIG. 8, the chucker 67 grips the fiber bundle F, and thereafter asillustrated in FIG. 9, the processing section 51 is moved to theactivated position PA. Similarly to FIG. 8, the chucker 67 is locatedupstream in the fiber bundle supplying direction FA with respect to theheater 63. The heater 63 is also directed towards the outercircumferential surface 1AS of the tubular portion 1A. The heater 63brings the fiber bundle F into contact with the outer circumferentialsurface lAS of the tubular portion 1A and heats the contacting portion,whereby the thermosetting resin impregnated in the fiber bundle F iscured and to fix the fiber bundle F to the fiber bundle F previouslywound in the hoop winding. The cutter 62 is still retracted into thefixing portion main body 65 and retreats to the position not makingcontact with the fiber bundle F.

As illustrated in FIG. 10, when the fiber bundle F is fixed to the fiberbundle F previously wound in the hoop winding by the heater 63, thecutter 62 projects out with respect to the fixing portion main body 65and cuts the fiber bundle F upstream in the fiber bundle supplyingdirection FA of the position (fixed position) where the fiber bundle Fis fixed. The hoop-wound fiber bundle F is thereby fixed to the outercircumferential surface 1AS of the tubular portion 1A at an endingposition of the hoop winding.

In FIG. 10, when the cutter 62 cuts the fiber bundle F, the processingsection 51 is moved from the activated position PA towards the retreatedposition PB, as illustrated in FIG. 11. The chucker 67 grips the fiberbundle F supplied from the fiber supply guide 72 of the winding table34. As illustrated in FIG. 3, the hoop winding device 30 is moved alongthe front-back direction of the FW device 100 from the position wherethe hoop winding is finished and is moved to the standby position. Thehoop winding device 30 waits at this position until the next helicalwinding is finished. Then, if the hoop winding is to be again carriedout, the next hoop winding is carried out from the state illustrated inFIGS. 1 and 6.

The FW device 100 according to the embodiment described above has thefollowing effects.

When starting the hoop winding, the end of the fiber bundle F is fixedto the outer circumferential surface 1S of the liner 1 to start the hoopwinding at the starting position of the hoop winding. When ending thehoop winding, the fiber bundle F is fixed to the outer circumferentialsurface 1S of the liner 1 and cut at the ending position of the hoopwinding. Thus, the fiber bundle F is fixed to the outer circumferentialsurface 1S of the liner 1 only when performing the hoop winding suchthat the hoop-wound fiber bundle F does not obstruct the helical windingdevice 40 when performing the helical winding. Consequently, the hoopwinding and the helical winding can be continuously carried outalternately. When starting the hoop winding, since the end of the fiberbundle F is fixed to the outer circumferential surface 1S of the liner 1to start the hoop winding at the starting position of the hoop winding,easy winding and combination winding of the fiber bundle F are notnecessary and the time required for the hoop winding can be shortened.Furthermore, since easy winding and combination winding of the fiberbundle F are not necessary, the usage amount of the fiber bundle F canbe reduced and the manufacturing cost can be reduced.

The fiber bundle F contains the thermosetting resin, where the fixationof the fiber bundle F to the outer circumferential surface 1S of theliner 1 brings the fiber bundle F into contact with the outercircumferential surface 1S of the liner 1 and heats the contactingportion. The thermosetting resin is thus cured and the fiber bundle canbe fixed to the outer circumferential surface 1S of the liner 1.

After fixing the fiber bundle F to the outer circumferential surface 1Sof the liner 1, the hoop winding is started with the tension of thefiber bundle F set lower than the defined tension, and the hoop windingis carried out for a predetermined number of winding such that the fiberbundles F overlap. The fixing portion of the fiber bundle F is therebyprevented from detaching by being pulled at high tension. Further, sincethe hoop winding is carried out with the tension of the fiber bundle Fset to the defined tension after performing the hoop winding for apredetermined number of times such that the fiber bundles F overlap, areinforcement layer having a defined strength can be formed.

After fixing the fiber bundle F to the outer circumferential surface 1Sof the liner 1, the hoop winding is started with the tension of thefiber bundle F set lower than the defined tension, and the hoop windingis carried out such that the fiber bundles F intersect. Since the fiberbundle F wound underneath is tightened and fixed by the fiber bundle Fwound above, the fixing portion of the fiber bundle F is reliablyprevented from detaching by being pulled at high tension.

When starting the hoop winding, the gripping part 64 grips the fiberbundle F downstream in the fiber supplying direction FA with respect tothe heater 63, brings the fiber bundle F into contact with the outercircumferential surface 1S of the liner 1 and heats the contactingportion with the heater 63. Consequently, the end of the fiber bundle Fcan be fixed to the outer circumferential surface 1S of the liner 1 atthe starting position of the hoop winding. When ending the hoop winding,the fiber bundle F is gripped upstream in the fiber bundle supplyingdirection FA with respect to the heater 63, the fiber F is brought intocontact with the outer circumferential surface 1S of the liner 1, andthe contacting portion is heated with the heater 63. Consequently, thefiber bundle F can be fixed to the outer circumferential surface 1S ofthe liner 1 and the fiber F can be cut by the cutter 62 at the endingposition of the hoop winding. Since the start and the end of the hoopwinding are automated and promptly carried out, the time required forthe hoop winding can be shortened.

The first embodiment of the present invention has been described above,but the present invention is not limited to this embodiment and variousmodifications can be made. For example, the positional relationshipbetween the winding table 34 and the fiber bundle processing device 50is not limited to the positional relationship illustrated in FIG. 5, andmerely needs to be a positional relationship in which the winding table34 and the fiber bundle processing device 50 do not interfere and thefiber bundle F supplied from the fiber supply guide 72 of the windingtable 34 can be gripped. Different positional relationships are realizedif the structure and the arrangement of the winding table 34 and thefiber bundle processing device 50 are different.

In the present embodiment, the gripping part 64 is moved with respect tothe heater 63, but the heater 63 may be moved with respect to thegripping part 64.

In the present embodiment, the FW device 100 including the hoop windingdevice 30 and the helical winding device 40 has been described, but thepresent invention may be applied to an FW device dedicated to hoopwinding.

Second Embodiment

An overall structure of a filament winding apparatus 1001 according to asecond embodiment of the present invention will be described withreference to FIG. 12. Hereinafter, the filament winding apparatus 1001will be referred to as the FW device 1001 for short. The same referencenumerals are denoted on portions where effects, functions, andstructures are common with the first embodiment, and the descriptionthereof may be omitted.

FIG. 12 is a side view illustrating the FW device 1001. The FW device1001 winds the fiber bundle F impregnated with resin around the liner 1by repeatedly carrying out hoop winding by a hoop winding device 301 andhelical winding by the helical winding device 40 on the liner 1alternately.

The hoop winding device 301 is mainly configured by the base 31, thepower mechanism 32, the hoop winding unit 33, and a yarn hooking device501. The driving of the hoop winding device 301 is controlled by acontrol section 80.

The winding table 34 is rotated in a direction of an arrow R in FIG. 13by the power mechanism 32. The fiber bundle F guided from the fibersupply guide 72 to the liner 1 is supplied in the direction of the arrowFA, which is the downstream side in the rotating direction of thewinding table 34, while being rotated in the direction of the arrow R,and wound around the liner 1 or a holding section 531 of the yarnhooking device 501 to be described later. The position where the fiberbundle F supplied from the fiber supply guide 72 makes contact with andis wound around the liner 1 or the holding section 531 of the yarnhooking device 501 is referred to as a winding position WP.

The power mechanism 32 for driving the winding table 34 is connected tothe control section 80, and the rotation and stop are controlled basedon a signal from the control section 80. A detecting section detects therotation angle of the winding table 34 and detects the position of thewinding table 34 is connected to the control section 80. An encoder, forexample, is used for the detecting section. The control section 80detects the position of the winding table 34 to specify the position ofthe bobbins 71 (71A, 71B, 71C, 71D), the winding position WP of thefiber bundle F, and the like. The control section 80 controls the powermechanism 32 while detecting the position of the winding table 34 tostop the rotation of the winding table 34 such that the fiber supplyguide 72 and the winding position WP of the fiber bundle F come to anarbitrary position.

Next, the yarn hooking device 501 will be described. The yarn hookingdevice 501 temporarily holds the fiber bundle F when starting the hoopwinding, and winds the fiber bundle F around the liner 1 from thestarting position of the hoop winding. As illustrated in FIG. 14, theyarn hooking device 501 is mainly configured by a base 511, a holdingtable 521, the holding section 531, and a cutter 541. As illustrated inFIG. 12, the yarn hooking device 501 is arranged at a position facing asurface where the winding of the fiber bundle F is carried out with ahoop winding unit 331, that is, a surface on which the bobbins 71 (71A,71B, 71C, 71D), the fiber supply guide 72, and the like are arranged.The yarn hooking device 501 is mounted on the hoop winding device rail12, and can relatively move with respect to the hoop winding unit 33.

The base 511 supports the holding table 521. The base 511 is mounted onthe hoop winding device rail 12, and moves with respect to the main base10 by a power mechanism. The power mechanism for moving the base 511 isconnected to the control section 80, and the relative position withrespect to the hoop winding unit 33 is controlled based on the signalfrom the control section 80.

The holding section 531 is arranged on a surface on the hoop windingunit 33 side of the holding table 521. The holding section 531 can windthe fiber bundle F by the hoop winding unit 33, and temporarily hold thefiber bundle F on the outer side in the radial direction of the liner 1.The holding section 531 is configured by a plurality of holding members5311. An opening 5211, through which the liner 1 is inserted, isprovided at the center of the holding table 521, where the plurality ofholding members 5311 are arranged to surround the liner 1 inserted intothe opening 5211 in a peripheral direction. In the present embodiment,six holding members 5311 are arranged at equal intervals on the samecircumference to surround the liner 1. The fiber bundle F is wound so asto be hooked to the plurality of holding members 5311 on the outer sideof the liner 1.

A gap is formed between a pair of adjacent holding members 5311. Thisgap forms a guiding section 551 that guides the fiber bundle F from theliner 1 to the holding section 531 in a retreating operation to bedescribed later. Each of the holding members 5311 is supported by a rail5321 at the holding table 521, and is movable in the radial direction ofthe holding table 521. Each holding member 5311 can move in the radialdirection of the holding table 521 by a power mechanism. The powermechanism for moving each holding member 5311 is connected to thecontrol section 80, and the position in the radial direction iscontrolled based on the signal from the control section 80. Theplurality of holding members 5311 are moved in the radial direction ofthe holding table 521 to enlarge or reduce the holding section 531 inthe radial direction of the liner 1.

The cutter 541 cuts the fiber bundle F. The cutter 541 is fixed on theholding table 521 and is extensible. The cutter 541 cuts the fiberbundle F (a part FE of the fiber bundle, see FIG. 18) bridged from theholding section 531 to the liner 1 in a first cutting operation, to bedescribed later, and cuts the fiber bundle F (a part FC of the fiberbundle, see FIG. 23) bridged from the liner 1 to the holding section 531in a second cutting operation. At other standby times, the cutter 541 isretreated to a position not making contact with the fiber bundle F.

Next, the operation of the hoop winding device 301 in the hoop windingof the FW device 1001 having the above structure will be described. Theoperation of the hoop winding device 301 in the hoop winding includes awinding starting operation, a first cutting operation, a windingoperation, a retreating operation, and a second cutting operation. Theliner 1 used in the present embodiment includes a tubular portion 1Ahaving a constant radius, and a dome portion 1B arranged at both ends ofthe tubular portion 1A (see FIG. 12). The liner 1 is mounted to theliner transfer device 20, and the hoop winding of the first layer iscarried out directly on the surface of the tubular portion 1A of theliner 1 in a state where the fiber layer is not yet formed on the liner1. The position to start the hoop winding with respect to the liner 1 isa starting position M located close to the center of the liner 1 in theaxial direction (see FIG. 15).

The control section 80 is input with the winding conditions of the hoopwinding, that is, the winding conditions set by the operator in advancesuch as the movement speed of the hoop winding device 301, the rotationspeed of the winding table 34, the number of times to reciprocate thehoop winding device 301, and the movement distance of the hoop windingdevice 301. Other operation conditions of the hoop winding device 301may also be set in advance. The control section 80 controls the drivingof the hoop winding device 301 based on the input winding conditions inthe following manner.

First, the control section 80 controls the winding starting operation.In the winding starting operation, before starting the hoop winding onthe liner 1, as illustrated in FIG. 15 and FIG. 16, the fiber bundle Fis wound around the holding section 531 of the yarn hooking device 501for an appropriate number of times by the hoop winding member 33, totemporarily hold the fiber bundle. The end of the fiber bundle F isfixed to the holding section 531 in advance with a tape or the like soas not to detach. For the first few windings, the subsequent fiberbundle F is wound to overlap the fiber bundle F wound underneath suchthat the fiber bundles F are not displaced.

When winding the fiber bundle F on the holding section 531, the hoopwinding member 33 and the holding section 531 are brought close to eachother such that the winding position WP of the fiber bundle F is on theholding section 531. The relative distance between the hoop windingmember 33 and the yarn hooking device 501 is gradually increased suchthat the winding position WP of the fiber bundle F gradually movestowards the free end of the holding section 531. Only one of the hoopwinding member 33 and the yarn hooking device 501 may be moved to changethe relative distance between the hoop winding member 33 and the yarnhooking device 501, or both of the hoop winding member 33 and the yarnhooking device 501 may be moved to change the relative distance.

As illustrated in FIG. 15, the winding of the fiber bundle F around theholding section 531 is carried out at a position located away from thestarting position M of starting the hoop winding on the liner 1, but thewinding may be carried out at a position located close to the startingposition M (see FIG. 17). Alternatively, the fiber bundle F may be woundaround the holding section 531 while bringing the hoop winding member 33and the yarn hooking device 501 close to the starting position M.

After winding the fiber bundle F around the holding section 531 for anappropriate number of times, as illustrated in FIG. 17 and FIG. 18, thecontrol section 80 moves the winding position WP of the fiber bundle Ffrom the holding section 531 to the liner 1 to start the hoop winding ofthe fiber bundle F around the liner 1 at the starting position M of thehoop winding. In order to move the winding position WP of the fiberbundle F from the holding section 531 to the liner 1, the relativedistance between the hoop winding member 33 and the yarn hooking device501 is increased and the winding position WP of the fiber bundle F ismoved from the free end of the holding section 531 to the liner 1. Inother words, the winding position WP of the fiber bundle F is loweredfrom the holding section 531 to the liner 1. For example, by positioningthe free end of the holding section 531 at the starting position M ofthe hoop winding and moving only the yarn hooking device 501 in the leftside direction illustrated in FIG. 17, the winding position WP of thefiber bundle F can be moved from the holding section 531 to the liner 1at the starting position M of the hoop winding. When the windingposition WP of the fiber bundle F is moved from the holding section 531to the liner 1, the fiber bundle F is bridged from the holding member5311 to the liner 1. This portion is indicated with a thick line in FIG.18 (a part FB of fiber bundle).

At the time that hoop winding has been carried out for a few windingsfrom the starting position M of the hoop winding, the control section 80controls the first cutting operation. In the first cutting operation,the fiber bundle F (the part FB of fiber bundle illustrated in FIG. 18)bridged from the holding section 531 to the liner 1 is cut with thecutter 541. Since the first cutting operation is carried out after thehoop winding is carried out for a few windings, the fiber bundle Fhoop-wound around the liner 1 is not unwound even if the first cuttingoperation is carried out. Since the fiber bundle F wound around theholding section 531 and the fiber bundle F hoop wound around the liner 1are separated by the first cutting operation, the hoop winding member 33and the yarn hooking device 501 can move to positions spaced apart fromeach other.

As illustrated in FIG. 19, the control section 80 controls the windingoperation of carrying out the hoop winding of the fiber bundle F withrespect to the liner 1. As illustrated in FIG. 19, the control section80 causes the hoop winding member 33 to carry out the hoop winding basedon the winding conditions input in advance. The control section 80causes the yarn hooking device 501 to retreat to the retreated positionwhere the hoop winding is not obstructed by the hoop winding member 33.The fiber bundle F wound around the holding section 531 is removed atthe retreated position.

As illustrated in FIGS. 20 and 21, when the winding position WP of thehoop winding reaches the ending position N (same position as startingposition M), the control section 80 controls the retreating operation.The control section 80 first stops the rotation of the winding table 34of the hoop winding member 33 and stops the hoop winding. Then, the yarnhooking device 501 is brought close to the hoop winding member 33. Whenthe free end of the holding section 531 is passed through the windingposition WP and brought closer to the hoop winding member 33 than thewinding position WP, the fiber bundle F is inserted to the guidingsection 551 of the holding section 531.

As illustrated in FIG. 22 and FIG. 23, the rotation of the winding table34 of the hoop winding member 33 is resumed with the fiber bundle Finserted to the guiding section 551 of the holding section 531, and thewinding position WP of the fiber bundle F is moved from the liner 1 tothe holding section 531. In other words, the winding position WP of thefiber bundle F is raised from the liner 1 to the holding section 531.When the winding position WP of the fiber bundle F is moved from theliner 1 to the holding section 531, the fiber bundle F is bridged fromthe liner 1 to the holding member 5311. This portion is indicated with athick line in FIG. 23 (a part FC of fiber bundle). The fiber bundle F isheld at the holding section 531 by winding the fiber bundle F around theholding section 531 for only an appropriate number of times. For thefirst few windings, the subsequent fiber bundle F is wound to overlapthe fiber bundle F wound underneath such that the fiber bundles F arenot displaced.

At the time that fiber bundle F is wound around the holding section 531for an appropriate number of times from the ending position N of thehoop winding, the control section 80 controls the second cuttingoperation. In the second cutting operation, the fiber bundle F (the partFC of fiber bundle illustrated in FIG. 23) bridged from the liner 1 tothe holding section 531 is cut with the cutter 541. Since the secondcutting operation is carried out after the fiber bundle F is woundaround the holding section 531 an appropriate number of times, the fiberbundle F wound around the holding section 531 is not unwound even if thesecond cutting operation is carried out. Since the fiber bundle F woundaround the holding section 531 and the fiber bundle F hoop-wound aroundthe liner 1 are separated by the second cutting operation, the hoopwinding member 33 and the yarn hooking device 501 can move to positionsspaced apart from each other. Furthermore, since the fiber bundle F iswound around the holding section 531 of the yarn hooking device 501 foran appropriate number of times by the hoop winding member 33, and thefiber bundle is in a temporarily held state, the operation of the nexthoop winding can be started in this state.

The FW device 1001 according to the second embodiment described abovehas the following effects.

When starting the hoop winding, the winding position WP of the fiberbundle F is moved from the holding section 531 to the liner 1 at thestarting position M of the hoop winding, and the winding startingoperation of starting the hoop winding of the fiber bundle F around theliner 1 is carried out. When ending the hoop winding, the windingposition WP of the fiber bundle F is moved from the liner 1 to theholding section 531 at the ending position N of the hoop winding, andthe retreating operation of winding the fiber bundle F around theholding section 531 to hold the fiber bundle F is carried out. Whenstarting the hoop winding in such a manner, the winding position WP ofthe fiber bundle F is moved from the holding section 531 to the liner 1at the starting position M of the hoop winding. Consequently, easywinding and combination winding of the fiber bundle F are not necessarywhen starting the hoop winding regardless of whether or not the fiberlayer is formed on the liner 1, and the time required for the hoopwinding can be reduced. Since easy winding and combination winding ofthe fiber bundle F are not necessary, the usage amount of the fiberbundle F can be reduced and the manufacturing cost can be reduced.

In the winding starting operation and the retreating operation, therelative position between the hoop winding member 33 and the holdingsection 531 is changed in the axial direction of the liner 1. Thewinding starting operation and the retreating operation thus can becarried out with fewer operations.

The holding section 531 is configured by a plurality of holding members5311 arranged in the circumferential direction of the liner 1, and eachof the holding members 5311 is moved in the radial direction of theliner 1 to enlarge or reduce the holding section 531. Thus, the liner 1of different radius can be easily responded.

The holding section 531 includes the guiding section 551 that guides thefiber bundle F from the liner 1 to the holding section 531 in theretreating operation. Thus, the fiber bundle F can be reliably woundaround the holding section 531 in the retreating operation.

Another embodiment of the invention has been described above, but theinvention is not limited to this embodiment and various modificationscan be made. For example, the yarn hooking device 501 is a separate bodyfrom the hoop winding member 33, but the holding section 531 may bearranged in the hoop winding member 33.

The holding section 531 is configured by columnar holding members 5311,but the present invention is not limited thereto, and the holdingsection 531 may have a cylindrical shape, for example. In this case, aportion that guides the fiber bundle F to the holding section 531 suchas a slit-like space having an end opened may be provided as the guidingsection 551.

In the present embodiment, the FW device 100 including the hoop windingdevice 301 and the helical winding device 40 has been described, but thepresent invention may be applied to an FW device dedicated to hoopwinding.

While the present invention has been described with respect toembodiments thereof, it will be apparent to those skilled in the artthat the disclosed invention may be modified in numerous ways and mayassume many embodiments other than those specifically set out anddescribed above. Accordingly, the appended claims cover allmodifications that fall within the true spirit and scope of theinvention.

What is claimed is:
 1. A filament winding method for performing a hoopwinding step, wherein the hoop winding step includes, a first step offixing an end of a fiber bundle to a liner surface at a startingposition of hoop winding, a second step of hoop winding the fiber bundlehaving the end fixed to the liner surface in the first step, a thirdstep of fixing the fiber bundle hoop wound in the second step to theliner surface at an ending position of the hoop winding, and a fourthstep of cutting the fiber bundle upstream in a fiber bundle supplyingdirection of a position where the fiber bundle is fixed in the thirdstep.
 2. The filament winding method according to claim 1, wherein thefiber bundle includes a thermosetting resin or a thermoplastic resin;and the fixation of the fiber bundle to the liner surface in the firststep and the third step brings the fiber bundle in contact with theliner surface and heats a contacting portion.
 3. The filament windingmethod according to claim 1, wherein the second step includes, a fifthstep of starting the hoop winding with a tension of the fiber bundle setlower than a defined tension, and performing the hoop winding for apredetermined number of times such that the fiber bundles overlap, and asixth step of performing the hoop winding with the tension of the fiberbundle set to the defined tension.
 4. The filament winding methodaccording to claim 2, wherein the second step includes, a fifth step ofstarting the hoop winding with a tension of the fiber bundle set lowerthan a defined tension, and performing the hoop winding for apredetermined number of times such that the fiber bundles overlap, and asixth step of performing the hoop winding with the tension of the fiberbundle set to the defined tension.
 5. The filament winding methodaccording to claim 3, wherein the fifth step includes performing thehoop winding such that the fiber bundles intersect.
 6. The filamentwinding method according to claim 4, wherein the fifth step includesperforming the hoop winding such that the fiber bundles intersect.
 7. Afilament winding apparatus for winding a fiber bundle around a linersurface, the filament winding apparatus comprising: a hoop windingdevice including a winding section for hoop winding the fiber bundlearound the liner surface, a fixing portion for fixing the fiber bundleto the liner surface, and a cutter for cutting the fiber bundle; and acontrol section for controlling a first fixing operation by the fixingportion to fix an end of the fiber bundle to the liner surface at astarting position of the hoop winding, a winding operation by thewinding section to hoop wind the fiber bundle having the end fixed tothe liner surface, a second fixing operation by the fixing portion tofix the hoop-wound fiber bundle to the liner surface at an endingposition of the hoop winding, and a cutting operation by the cutter tocut the fiber bundle upstream in a fiber bundle supplying direction of aposition where the fiber bundle is fixed in the second fixing operation.8. The filament winding apparatus according to claim 7, wherein thefiber bundle includes a thermosetting resin or thermoplastic resin; andthe fixing portion brings the fiber bundle into contact with the linersurface and heats the contacting portion.
 9. The filament windingapparatus according to claim 8, wherein the fixing portion includes aheater for heating the fiber bundle, and a gripping part capable ofgripping the fiber bundle both upstream and downstream in the fiberbundle supplying direction with respect to the heater; and the controlsection controls a first gripping operation by the gripping part to gripthe fiber bundle downstream in the fiber bundle supplying direction withrespect to the heater in the first fixing operation, and a secondgripping operation by the gripping part to grip the fiber bundleupstream in the fiber bundle supplying direction with respect to theheater in the second fixing operation.
 10. A filament winding method forperforming a hoop winding step, wherein the hoop winding step includes,a first step of winding a fiber bundle around a holding section on anouter side in a radial direction of a liner to temporarily hold thefiber bundle, a second step of moving a winding position of the fiberbundle from the holding section to the liner to start the hoop windingof the fiber bundle around the liner at a starting position of the hoopwinding, a third step of cutting the fiber bundle bridged from theholding section to the liner, a fourth step of performing the hoopwinding of the fiber bundle with respect to the liner, a fifth step ofmoving the winding position of the fiber bundle from the liner to theholding section to wind the fiber bundle around the holding section andhold the fiber bundle at an ending position of the hoop winding, and asixth step of cutting the fiber bundle bridged from the liner to theholding section.
 11. A filament winding apparatus for winding a fiberbundle around a liner, the apparatus comprising: a hoop winding deviceincluding a winding section for performing hoop winding of the fiberbundle with respect to the liner, a holding section around which thefiber bundle is wound by the winding section and that temporarily holdsthe fiber bundle on an outer side in a radial direction of the liner,and a cutter for cutting the fiber bundle; and a control section forcontrolling, a winding starting operation of moving a winding positionof the fiber bundle from the holding section to the liner to start thehoop winding of the fiber bundle around the liner at a starting positionof the hoop winding after winding the fiber bundle around the holdingsection, a first cutting operation of cutting the fiber bundle bridgedfrom the holding section to the liner by the cutter, a winding operationof performing the hoop winding of the fiber bundle with respect to theliner, a retreating operation of moving the winding position of thefiber bundle from the liner to the holding section to wind the fiberbundle around the holding section and hold the fiber bundle at an endingposition of the hoop winding, and a second cutting operation of cuttingthe fiber bundle bridged from the liner to the holding section by thecutter.
 12. The filament winding apparatus according to claim 11,wherein the control section performs control to change a relativeposition between the winding section and the holding section in an axialdirection of the liner in the winding starting operation and theretreating operation.
 13. The filament winding apparatus according toclaim 11, wherein the holding section is configured by a plurality ofmembers arranged in a circumferential direction of the liner, theplurality of members being moved in the radial direction of the liner toenlarge or reduce the holding section.
 14. The filament windingapparatus according to claim 12, wherein the holding section isconfigured by a plurality of members arranged in a circumferentialdirection of the liner, the plurality of members being moved in theradial direction of the liner to enlarge or reduce the holding section.15. The filament winding apparatus according to claim 11, wherein theholding section includes a guiding section for guiding the fiber bundlefrom the liner to the holding section in the retreating operation. 16.The filament winding apparatus according to claim 12, wherein theholding section includes a guiding section for guiding the fiber bundlefrom the liner to the holding section in the retreating operation. 17.The filament winding apparatus according to claim 13, wherein theholding section includes a guiding section for guiding the fiber bundlefrom the liner to the holding section in the retreating operation. 18.The filament winding apparatus according to claim 14, wherein theholding section includes a guiding section for guiding the fiber bundlefrom the liner to the holding section in the retreating operation.